[Premium-Rx] Cubic R-3030: Problems and WTD original manual

[Francesco Ledda]

The fault after swapping synthesizer modules is not unusual; sometimes,
adjustments are required to remove the fault after a new/used module is
installed.

Before working on any of these dual Cubics, I mark the modules L or R.

Have you swapped the pre-selectors?

I know, everybody hates those cheap keypads......

F


-----Original Message-----
From: premium-rx-bounces at mailman.qth.net
[mailto:premium-rx-bounces at mailman.qth.net] On Behalf Of Heinz Breuer
Sent: Tuesday, July 10, 2012 3:44 PM
To: premium-rx at mailman.qth.net
Subject: [Premium-Rx] Cubic R-3030: Problems and WTD original manual

Hello,
I spent some time with my new Cubic R-3030 and discovered a couple issues.
The receiver came out of the RAF in the UK and carries a nameplate
Malborough Communications Ltd, MCR-3030B Dual Receiver, it was probably just
rebadged.
The Cubic R-3030 is actually two identical receivers in a single cabinet.
Overall the cosmetic condition is good but the foil keyboards are annoying.
There is either no contact or the key bounces. Anybody has a solution for
it?

The right receiver is sometimes deaf on some frequencies (half octave
bands). I traced it down to the preselector module or its control. When I
remove the preselector module and put the antenna signal into the
preselector output socket on the base plate receiption is fine. I have not
yet checked if the BCD coded control signals are always there or not.

Today after about 3 hours and the receiver pretty warm while testing and
swapping modules the left receiver went dead. The FAULT light came on and
the FAULT LED on the Fine Loop was lit. After recycling power the FAULT
light was off and didn't come back but there was still no audio. I
discovered that I have receiption when I turn off AGC completely and adjust
rf gain via the keyboard.

I guess that I might have a temperature related fault and probably some
capacitors need to be replaced too.
I downloaded the manual but the schematics are not easy to read. I have not
yet deciphered which module is responsible for the AGC on the left receiver.
If anybody has an original manual for sale or could provide clear xeroxed
copies please contact me.

My receiver has the IEEE-488 remote control. Anybody has a software to
control the R-3030 via IEE-488?
OTH I would prefer a RS-232 module if somebody has one for sale please
contact me.

This is probably a long shot but if somebody has an extender for the modules
I am looking for one.
vy 73 Heinz DH2FA, KM5VT

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